package com.atguigu.springboot.config;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author : wenchao.long
 * @date : Created in 2020/11/23 8:11 周一
 * @description :
 */
public class LoginHandlerInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 目标方法执行之前
        Object loginUser = request.getSession().getAttribute("loginUser");
        if (loginUser == null) {
            // 如果他是空的，证明没有登录
            request.setAttribute("msg", "没有权限请先登录");
            request.getRequestDispatcher("/index.html").forward(request, response);
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
